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5 metres of cloth cost 210. The cost of 10 metres is:

A105
B630
C420
D210
Answer & Solution
Correct answer: C. 420
1. Length and cost are in direct proportion. 2. Double the length doubles the cost. 3. So 10 metres cost 420. _Source: syllabus Mathematics, Chapter 13, Direct and Inverse Proportions._
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